Genome-Wide Differential Methylation Profiles from Two Terpene-Rich

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Genome-Wide Differential Methylation Profiles from Two Terpene-Rich plants Article Genome-Wide Differential Methylation Profiles from Two Terpene-Rich Medicinal Plant Extracts Administered in Osteoarthritis Rats Younhee Shin 1,† , Sathiyamoorthy Subramaniyam 1,†, Jin-Mi Chun 2 , Ji-Hyeon Jeon 1,3 , Ji-Man Hong 1, Hojin Jung 1, Boseok Seong 4 and Chul Kim 4,* 1 Research and Development Center, Insilicogen Inc., Yongin-si 16954, Korea; [email protected] (Y.S.); [email protected] (S.S.); [email protected] (J.-H.J.); [email protected] (J.-M.H.); [email protected] (H.J.) 2 Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine, 111 Geonjae-ro, Naju-si 58245, Korea; [email protected] 3 Department of Biological Sciences, Sungkyunkwan University, Suwon 16419, Korea 4 Future Medicine Division, Korea Institute of Oriental Medicine, 1672 Yuseong-daero, Yuseong-gu, Daejeon 34054, Korea; [email protected] * Correspondence: [email protected]; Tel.: +82-42-868-9582 † These authors contributed equally to this work. Abstract: Extracts from the plants Phlomis umbrosa and Dipsacus asperoides—which are widely used in Korean and Chinese traditional medicine to treat osteoarthritis and other bone diseases—were used to treat experimental osteoarthritis (OA) rats. Genome-wide differential methylation regions Citation: Shin, Y.; Subramaniyam, S.; (DMRs) of these medicinal-plant-treated rats were profiled as therapeutic evidence associated with Chun, J.-M.; Jeon, J.-H.; Hong, J.-M.; traditional medicine, and they need to be investigated further using detailed molecular research Jung, H.; Seong, B.; Kim, C. to extrapolate traditional practices to modern medicine. In total, 49 protein-encoding genes whose Genome-Wide Differential Methylation expression is differentially regulated during disease progression and recovery have been discovered Profiles from Two Terpene-Rich via systematic bioinformatic analysis and have been approved/proposed as druggable targets for Medicinal Plant Extracts Administered various bone diseases by the US food and drug administration. Genes encoding proteins involved in in Osteoarthritis Rats. Plants 2021, 10, 1132. https://doi.org/10.3390/ the PI3K/AKT pathway were found to be enriched, likely as this pathway plays a crucial role during plants10061132 OA progression as well as during the recovery process after treatment with the aforementioned plant extracts. The four sub-networks of PI3K/AKT were highly regulated by these plant extracts. Overall, Academic Editors: Martina Grdiša 29 genes were seen in level 2 (51–75%) DMRs and were correlated highly with OA pathogenesis. Here, and Suresh Awale we propose that these genes could serve as targets to study OA; moreover, the iridoid and triterpenoid phytochemicals obtained from these two plants may serve as potential therapeutic agents. Received: 21 April 2021 Accepted: 28 May 2021 Keywords: Dipsacus asperoides; osteoarthritis; Phlomis umbrosa; iridoid; triterpenoid; rats Published: 2 June 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in 1. Introduction published maps and institutional affil- In the genomic era, genome-wide methylation profiles enable precise combinatorial iations. drug screening for the treatment of various human diseases [1]. The one-drug, one-target mechanism is associated with various adverse effects, as it targets a single node in the complex molecular networks. Although moving toward combinatorial drug therapy involves another complex layer, i.e., the selection of an effective drug ratio for specific Copyright: © 2021 by the authors. diseases—a laborious and expensive task [2]. To date, most of the functional combinations Licensee MDPI, Basel, Switzerland. of drugs have been identified either from clinical trials or via prescription in medical This article is an open access article practices. Similar approaches have been used in traditional medical practices since ancient distributed under the terms and times, but they have been associated with adverse reactions as well [3]. conditions of the Creative Commons With the help of recent advancements, we can formulate drugs that exhibit reduced tox- Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ icity and can help people gain access to low cost medicines for various diseases. However, 4.0/). as most traditional medicine formulations prepared using regional plants are documented Plants 2021, 10, 1132. https://doi.org/10.3390/plants10061132 https://www.mdpi.com/journal/plants Plants 2021, 10, 1132 2 of 14 in the local language, the understanding of the mechanism of action of certain regional phytochemical products is further complicated by the language barrier. Thus, to iden- tify a molecular signature that can be universally understood, we initiated genome-wide differential methylation screening for two oriental medicinal plant extracts (i.e., Phlomis umbrosa (PU) [4] and Dipsacus asperoides (DA) [5]), which were used to treat rats with mono-iodoacetate (MIA)-induced osteoarthritis (OA). OA is a heterogeneous disease caused by various unknown factors [6] and is charac- terized by chronic joint pain caused by destruction of the cartilage and synovial membrane tissue at the knee joint. Extensive efforts have been made to understand the disease pathogenicity and to identify biomarkers for OA. For example, the insight of cell hetero- geneity was assessed via a single-cell transcriptome study that identified the different clusters of synoviocytes (rich in the glycoproteins required for lubrication) and chondro- cytes (which produce the structural components of cartilage) from the knee cartilage [7]. One of the main challenges in treating OA is the low-grade inflammation, which causes the destruction of the smooth tissues around the joints [6]. Interestingly rheumatoid arthritics (RA) also has the same phenotype; however, the underlying mechanisms are different from those involved in OA. The repurposing of RA drugs for OA failed due to this very reason [6]. To date, none of the approved drugs can reverse the phenotypes associated with OA and other bone-related diseases. Only a few molecules that target signaling pathways, such as Wnt and PI3K/AKT, are currently undergoing clinical trials for investigating their effects on OA [6,8]. Among these, some steroidal drugs are structurally similar to di- and tri-terpenoids [6]. Phlomis umbrosa Turczanimow (Family, Lamiaceae), is a medicinal plant, which has been used to treat allergic conditions [9], improve bone growth [10], and manage bone- related diseases, such as OA and osteoporosis [11,12]. Another medicinal plant, Dipsacus asperoides C.Y.Cheng & T.M.Ai (Family, Caprifoliaceae) is used to treat broken bones and liver abnormalities [13]. Both these medicinal plants are rich in iridoids, polyphenols, and saponins [4]. All three major groups of phytochemicals possess versatile therapeutic properties, which are being explored by scientists [14–16]. Particularly, iridoids are natural bioactive components that exert anti-inflammatory, hepatoprotective, neuroprotective, anti-tumor, and hypolipidemic effects [14]. For instance, loganin is an iridoid present in certain plants that exhibits a neuroprotective effect via the insulin-like growth factor-1 receptor (IGF1R) and glucagon-like peptide-1 receptor (GLP1R). It is also used in combination with LY294002 (PI3K/AKT inhibitor) to reduce extracellular matrix degradation in chondrocytes [17]. These two plant extracts were able to reduce an experimental OA phenotype in rat models, and nearly normalized the condition of the rats [4,5]. However, the molecular mechanisms and signaling pathways involved when cells are subjected to chemical perturbations are not clearly understood. Certain facts are known, including that methylation changes mostly occur during development and aging, and relatively few methylation changes are observed upon exposure to environmental stress factors. Considering data from several genome-wide methylation studies, we noted that chemical perturbations were observed in only five to ten percent of differentially methy- lated regions [18]. Taking these factors into consideration, we studied the differentially methylated regions (DMRs) in rats with MIA-induced OA treated with the above men- tioned plant extracts. Additionally, the DMRs were correlated with molecular entities curated on DrugBank and the human genome to support this experimentalist approach. 2. Results 2.1. CpG Profiles and DMRs The model includes three groups with three biological replicates each and a control (Figure1). On average, 5.8 Gb of bases for each sample were sequenced, and 74.8% of the se- quenced bases were mapped to the reference genome with 5.5 log2 coverage (Figure S1A,B). The principal component analysis and dendrogram cluster of CpG methylation sites clearly Plants 2021, 10, x 3 of 15 2. Results 2.1. CpG Profiles and DMRs The model includes three groups with three biological replicates each and a control Plants 2021, 10, 1132 (Figure 1). On average, 5.8 Gb of bases for each sample were sequenced, and 74.8% of3 ofthe 14 sequenced bases were mapped to the reference genome with 5.5 log2 coverage (Figure S1A,B). The principal component analysis and dendrogram cluster of CpG methylation sites clearly revealed the variance in the biological replicates (Figure S2A,B). In total, 1,861,526revealed theCpG variance regions inwere the covered—15,786 biological replicates (94.8%) (Figure of the S2A,B). genes Infrom total, the 1,861,526 reference CpG ge- nomeregions (Figure were covered—15,7862A), distributed
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